Sash-balance



(No Model.)

S. N. GOLDY.

SASH BALANOE.

No. 466,941. Patented Jan. 12, 1892.

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TNE NORRIS rz'rsnspo, mow-mam, WASHINGTON, u. c,

UNITED STATES PATENT OFFICE.

SAMUEL N. GOLDY, OF SAN FRANCISCO, CALIFORNIA.

SASH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 466,941, dated January12, 1892.

Application filed April 14, 1891- Serial No. 388,879. (No model.)

,To all whom it may concern;

and I do declare the following to be a full, clear, and exactdescription of the invention,

such as will enable others skilled in the art to which it appertains tomake and use the same,

reference being had to the accompanying drawings, and to the letters andfigures of reference marked thereon, which form a part of thisspecification.

This invention relates to a sash-balance in which a gear-wheel meshingwith a rack-plate on the sash is secured to a combined springactuatedfusee and barrel, with which latter another like fusee and barrel isconnected by a flexible connection attached at one end to one of thefusees at its largest diameter and atits other end to the barrel of theopposite combined fusee and barrel, wherebyI am enabled to usecomparatively short springs, the tension of the springs is equalized atall points of-elevation of the sash, and compensation is made for lossof tension of the springs when the sash is raised. I accomplish theabove results by means of the mechanism illustrated in the accompanyingdrawings, in which Figure 1 is an end elevation of the sashbalance, thecasing being in section, showing the position occupied by the operatingmechanism. Fig. 2 is a side elevation, the casing and one of thecombined fusee and barrel,

cylinders being in section, showing the gearwheel of the other fusee andbarrel in engagement with a rack-plate on the sash. Fig. 3 is an endelevation showing the casing as it appears when in the frame.

Referring to the drawings, A designates the face-plate, B the rim, and CC the side plates, of the boxing or casing in which the operatingmechanism is housed, which boxing is fitted and secured in a recessformed in the window-frame D. The face plate is formed of two sections 12, the one having lugs 3 and the other recesses 4:, in which the formerfit to hold the sections in the. proper position with relation to eachother, screws 5 passing through the two sections, serving to hold themtogether. The section 2 is formed with a recess 6,into Which fits ashoulder 7, carried by the section 1, the vertical wall of the recessand the shoulder forming a slot 8, the width of which may be increasedor diminished by lengthening or shortening the said shoulder.

E F designate two combined fusee and barrel cylinders, which for thesake of convenience of description will be hereinafter (165-.

ignated as fuseecylinders, which cylinders are loosely mounted uponshafts G, journaled in the sides 0 C of the casing. One end of each ofthese shafts carries a rigidly-attached ratchet-wheel H, which isengaged by pawls 9 on the side 0 of the casing, whereby the said shaftsare free to revolve in but one direction only. The end of each shaft isalso provided with a recess 10, into which a key is inserted when it isdesired to turn the shaft, for a purpose that will presently appear.

I designates two helical springs, one end of each of which is secured toshaft G and the other end to the inner surface of the said cylinder.

J designates a gear-wheel which is carried by the cylinder E, a portionof the periphery of which wheel extends through the slot 8 in theface-plate and engages a rack-plate K, carried by the window-sash.

L designates a pin which is mounted in an apertured lug 11 on section 2of the face-plate and carries on its inner end a toe 12, designed to beturned into engagement with the gearwheel J to prevent uncoiling of thesprings when the sash is removed, a projection 13, working in a slot 14in the lug, serving as a stop to prevent the toe being turned too far.The outer end of the pin is provided with a nick 15, into which isinserted the point of a screw-driver when it is desired to turn the pinfor the purpose above stated.

The cylinders E F, to which reference has been made, are eachconstructed with a tapered spirally-grooved fusee portion 16 and with astraight or barrel portion 17, which portions are preferably of the samedimensions in each cylinder, although, if desired, the dimensions may bevaried. A cable or chain M serves to connect the two cylinders and issecured to the large diameter of fuseo 16 of one cylinder and to thestraight or barrel portion 17 of the other cylinder.

In setting the balance for operation the springs are put under thedesired tension by turning the shafts in the manner described, whichtension is sufficient to hold the window at its highest raised point, atwhich time the cable is wound upon the cylinder F. As the window islowered the cable is unwound from cylinder F and wound upon cylinder E,and as the cable is leaving the largest diameter and is approaching thesmallest diameter of both cylinders, and vice versa when the window israised, it follows that the tension of both springs is equalized,thereby requiring but little power either to raise or to lower a window.7

In practice the gear J is preferably made of such a size that itwill notmake more than three revolutions while the sash is being raised to itsfull height, thus causing but a small loss of tension in the springs,and, as a consequence, requiring but a small change of the diameter ofthe cylinder; but it is to be understood that I may, if desired,diminish the diameter of gear J and increase the diameter of cylinders EF. By either construction, but preferably by the former, I provide foran increase of leverage as the springs lose tension and the reverse whenthey are being placed under tension, whereby thetensionof the springs isalways equalized whether the sash is being rfaisedor lowered. By meansof the barrel portions of the cylinders the gear J is allowed,preferably, to make one complete revolution before the cable begins toclimb the tapered portions, as the loss of tension in one revolution isso slight as scarcely to be perceptible and not enough to effect theworking of the sash-balance.

Having thus fully described my invention, whatI claim as new, and desireto secur'eby Letters Patent, is''- I 1. In a sash-balance, a casing, twospringactuated fusee-cylinders jour'naled therein, one of which carriesa gear-wheel, and a flexible connection uniting the large diameter ofone cylinder with the small diameter of the other cylinder andcontacting normally with the small diameters of the two cylinders, incombination with a fixed rack-plate with which the said gear-wheelmeshes.

2. In a sash-balance, a casing, two springactuated fusee-cylindersjournaled therein, each consisting of a fusee portion anda barrelportion, a gear-wheel carried by one of the cylinders, and a flexibleconnection uniting the said cylinders, in combination with a rackplatewith which the said gear-wheel meshes. 3. In a sash-balance, a casing,two shafts journaled therein, fusee cylinders loosely mounted on theshafts, one of which cylinders carries a gear wheel, springs connectingthe shafts and the cylinders, and a flexible connection uniting the twocylinders, in combination with a fixed rack-plate with which the saidgearwheel meshes.

4. In a sash=balance, a casing, two shafts journaled therein, fuse'ecylinders loosely mounted on the shafts, one of which cylinders carriesa gear wheel, springs connecting the shafts and the cylinders, means forregulating the" tension of the springs, and a flexible connectionuniting the two'cylinders, in combination with a rack-plate adapted tobe engaged by the saidgear-wheel.

5. In a sash-balance, a casing, two shafts journaled therein carryingrigidly attached ratchet-wheels, pawls carried by the casing andengaging'the said wheels,fusee cylinders loosely mounted on the shafts,one of which cylinders carries a gear-wheel, helical springs connectingthe Shafts and the cylinders, and a flexible connection nnitingthe' twocylinder's, in combination with a fixed rack-plate with which the saidgear=wheel meshes.

In testimony whereof I affix my signature in presence of two witness-es,

I SAMUEL N. GOLDY. Witnesses:

J AS. 0. L. WADswoRTH, GEO. T. KNox.

